Hello Gitte,
I've had rsd for 26 years, and between that and many others here, I think we'd raise quite an argument with your pediatric neurologist about rsd not being able to strike in the back, or spine!
It is where mine started and spread from.

NEVER let a doctor tell you or Oliver, that his pain is in his head!
A Psychiatrist is an excellent idea!

For side effects of meds, and especially on a child, you'd need to check the internet. (Keep in mind, side effects can be different for children).

My temp. is usually a degree cooler than normal, but, I feel hot.

I know I haven't answered all your questions, but there are others who will help.

Another thing about calling the doctor, explain to the call taker, you've been calling, and ask to make a phone appointment, for the beginning, or, end of the day (for example).

Keep your faith, and Be well! Send our Faith to Oliver!

Pete